Standard features：
1）norminal diameter：DN15 ~ 300(NPS½"-48")
2）pressure：PN 16 ~ 420(Class 150lbs-2500lbs)
3）suitable temperature： -28℃(-18.4℉)~300℃(572℉)
4）suitable medium,：for petroleum，liquefied natural gas/liquefied petroleum gas, petrochemical engineering, Iron and steel plants，heat supply pipeline.
5）operation mode：Lever, gear,（vertical/horizontal），electric driven，worm gear
6) linkage mode：welding,flange
Standard: API, ANSI, BS, DIN, JIS, etc.

material:
body: WCB ST37.0 , A106-B, No20
ball: stainless steel 304 or 316
stem: 2Cr13
sealing of stem: whole Fluorine rubber
ball sealing: RTFE（PTFE+C）